I don't know what you are talking about but I got it working by setting virus detectiong off. Later on I did some magic to my computer and now I don't even need to set virus detection off while playing the game.

It looks like if you have not configured Steam to run in background... or haven't gotten the steam configured properly. Doom 3 BFG edition needs Steam to run it because Doom 3 BFG have CGF and encryption file that requires Steam to do it... Steam must have internet access to download the updates.. and validation process must be allowed to complete...